143 lines
4.6 KiB
C
143 lines
4.6 KiB
C
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/*
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* Silicon Graphics RLE 8-bit video decoder
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* Copyright (c) 2012 Peter Ross
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Silicon Graphics RLE 8-bit video decoder
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* @note Data is packed in rbg323 with rle, contained in mv or mov.
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* The algorithm and pixfmt are subtly different from SGI images.
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*/
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#include "libavutil/common.h"
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#include "avcodec.h"
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#include "internal.h"
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static av_cold int sgirle_decode_init(AVCodecContext *avctx)
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{
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avctx->pix_fmt = AV_PIX_FMT_BGR8;
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return 0;
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}
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/**
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* Convert SGI RBG323 pixel into AV_PIX_FMT_BGR8
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* SGI RGB data is packed as 8bpp, (msb)3R 2B 3G(lsb)
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*/
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#define RBG323_TO_BGR8(x) ((((x) << 3) & 0xC0) | \
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(((x) << 3) & 0x38) | \
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(((x) >> 5) & 7))
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static av_always_inline
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void rbg323_to_bgr8(uint8_t *dst, const uint8_t *src, int size)
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{
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int i;
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for (i = 0; i < size; i++)
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dst[i] = RBG323_TO_BGR8(src[i]);
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}
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/**
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* @param[out] dst Destination buffer
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* @param[in] src Source buffer
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* @param src_size Source buffer size (bytes)
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* @param width Width of destination buffer (pixels)
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* @param height Height of destination buffer (pixels)
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* @param linesize Line size of destination buffer (bytes)
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*
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* @return <0 on error
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*/
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static int decode_sgirle8(AVCodecContext *avctx, uint8_t *dst,
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const uint8_t *src, int src_size,
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int width, int height, ptrdiff_t linesize)
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{
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const uint8_t *src_end = src + src_size;
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int x = 0, y = 0;
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#define INC_XY(n) \
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x += n; \
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if (x >= width) { \
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y++; \
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if (y >= height) \
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return 0; \
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x = 0; \
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}
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while (src_end - src >= 2) {
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uint8_t v = *src++;
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if (v > 0 && v < 0xC0) {
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do {
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int length = FFMIN(v, width - x);
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if (length <= 0)
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break;
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memset(dst + y * linesize + x, RBG323_TO_BGR8(*src), length);
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INC_XY(length);
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v -= length;
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} while (v > 0);
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src++;
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} else if (v >= 0xC1) {
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v -= 0xC0;
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do {
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int length = FFMIN3(v, width - x, src_end - src);
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if (src_end - src < length || length <= 0)
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break;
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rbg323_to_bgr8(dst + y * linesize + x, src, length);
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INC_XY(length);
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src += length;
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v -= length;
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} while (v > 0);
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} else {
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avpriv_request_sample(avctx, "opcode %d", v);
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return AVERROR_PATCHWELCOME;
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}
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}
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return 0;
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}
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static int sgirle_decode_frame(AVCodecContext *avctx, void *data,
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int *got_frame, AVPacket *avpkt)
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{
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AVFrame *frame = data;
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int ret;
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if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
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return ret;
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ret = decode_sgirle8(avctx, frame->data[0], avpkt->data, avpkt->size,
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avctx->width, avctx->height, frame->linesize[0]);
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if (ret < 0)
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return ret;
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frame->pict_type = AV_PICTURE_TYPE_I;
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frame->key_frame = 1;
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*got_frame = 1;
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return avpkt->size;
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}
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AVCodec ff_sgirle_decoder = {
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.name = "sgirle",
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.long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics RLE 8-bit video"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_SGIRLE,
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.init = sgirle_decode_init,
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.decode = sgirle_decode_frame,
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.capabilities = AV_CODEC_CAP_DR1,
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};
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